Improvement in locks



UNITED STATES PATENT OFFICE.

JACOB POST, OF NEWARK, NEW JERSEY.

IMPROVEM ENT IN LOCKS.

To all 'whom it may concern:

Beit known that I, JACOB POST, of Newark, in'the county of Essex and Sta-te of New Jersey, have invented a new and useful Improvement` in Locks; and I do hereby declare that the following is a full, clear, and exact description thereof, which will enable those skilled in the art to make and use the saine, reference bein g had to the accompanying drawings, forming part of this specification.

The present invention relates more particularly to latch-locks, and consists in a certain new and useful arrangement of parts in connection with thelatch-bolt ofthe same, whereby the bolt can be so fixed or secured, whether locked or unlocked, as to prevent it being moved by the key when inserted within the key-hole or aperture ot' the saine.

In the accompanying plate of drawings my improvement is illustrated, `Figure l being a View of the interior of the lock-casing with one of its side plates detached; Fig. 2, an end view of the same, showing a door to which it is attached in section.

a a. in the drawings represent the'outer casing or box ot' the lock, having apertures b b b in the same for the insertion of screws for fastenin g it to a door or other suitable place. Within this casing or box and extending in the direction of its length is a sliding latch-bolt, c, projecting from each of its end pieces, d d, and moving in suitable guiding apertures thereof, which bolt has a't or near one of its ends two notches, ff, and is cut away for a portion of its length within and between the end plates of the box.

g is a plate or bar, Vmade with a right angular projecting arm, h, at each of its ends and Ion the same side thereof, placed and resting upon the cut-awa y portion of thebolt @,between it and the outer casing, one arm ot' the said plate having a slot, l, across its width and 1u the same direction with the latch-bolt, fitting over a iixed piu, m, of the lock, and the other arm, by its notched end at, engaging with an angular-shaped projecting piece, z, of the lockcasing, against which it is held by a spiral spring, p, hung at one end upon the curved arm q of the plate g, and at the other to the arm r of the latch-bolt.

j sis the latchstop for limiting the outward play of the latch end t of the bolt, and u a lug on bolt between the arms of the plate g, against which lug, when the proper-shaped key is inserted in the key-hole ofthe lock, the bit thereot' comes to a bearing, as represented in the drawings by dotted lines, moving in the latch end of the sliding bolt and dsengaging it from the jambs of the`door, the spring p throwing it ont as the key-bit disengagcs itself from the lug of the bolt, as in ordinary locks.

It' desired to secure the latch-bolt of the lock, either when in a locked or unlocked position, take the inner end ofthe same by its thumbpiece c and move it sufficiently to cause either one of its notches to engage with the lock-casing, according to the position of the bolt where it is held by the spiral spring of the lock, the plate g to which it is hung being disengaged from the angular projection and resting by its end y upon the incline z of the same, as is plainly represented in red lines in Fig. 1.

I claim as new and desire to secure by Letters Patent- The combination, with the notched latch-bolt c of a lock, of the spring bar or plate `g, and arranged together with regard to each other and operating substantially as herein described, and for the purpose specified.

JACOB POST.-

Witnesses THos. W. LANGsTRoTH, J. S. CRANE. l 

